New
#11
As SIW2 rightly pointed out, you seem to have a lot of extra fonts i.e. those other than the default fonts. If you dont need them or can afford to delete them go ahead, just remember whatever you use them to view will not render properly once these are deleted.
Also, unless my math has become history, the size of your C: drive is only around 20 gig. Why so? Thats really cramped, if your hard disk has other partitions you should resize and allot at least 50-60 gigs for C: drive, even more if possible. You'll need to use a 3rd party partition manager like partition wizard to do that.
You also seem to have user files (.jpeg, .rar, .7z etc.) on this drive, these can be moved off to an external drive.
Other than that, just get a bigger hard drive.